Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 941 for “"Power Systems"”.
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Stochastic stability of power systems
… utilization of synchronous machines in electric power systems as central generators and in electric drive applications as high-performance motors makes their modeling, simulation, state estimation, and analysis important in many scenarios; however, the multiple time-scale nature of the associated …
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Nonlinear dynamics in power systems
We use a perturbation analysis to predict some of the instabilities in a single-machine quasi-infinite busbar system. The system’s behavior is described by the so-called swing equation, which is a nonlinear second-order ordinary-differential equation with additive and multiplicative harmonic terms …
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Decentralized Synergetic Control of Power Systems
… to enhance the transient stability of power systems. Due to the nonlinearities and complexities of the system, nonlinear control design techniques are required to improve its dynamic performance. In this dissertation a synergetic control technique is being proposed to design …
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DECENTRALIZED CONTROLLERS FOR INTERCONNECTED POWER SYSTEMS
… oscillations in a multi-machine electrical power system. A particular real power system comprised of five generating plants and an infinite bus was investigated in these studies. A review is given of the approaches used at present to improve system damping using power system stabilizers and …
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Investigation of portable nuclear power systems
… electronic devices do not simply plug into the power grid, due to their size, use, or distance from infrastructure. The use of nuclear power is well-established in large-scale power production, but mostly unutilized in small-scale applications. One potential candidate for small-scale power …
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Nonlinear oscillations in high power systems
… on nonlinear phenomena affecting high power systems and on the strategies adopted to model them. In the first chapter the attention is focused on two big areas of high power systems: power electronics and systems/devices used to sustain plasma fusion. Although it is common that System …
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Reserve Valuation in Electric Power Systems
The scheduled reserve has an economic value since it reduces the outage costs. In several electricity markets, reserve demand functions have been implemented to take into account the value of reserve in the market clearing process. These often take the form of a step-down function at the reserve …
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Risk-sensitive optimization for power systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Conic optimization of electric power systems
The electric power grid is recognized as an essential modern infrastructure that poses numerous canonical design and operational problems. Perhaps most critically, the inherently large scale of the power grid and similar systems necessitates fast algorithms. A particular complication distinguishing …
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Reuse of hybrid car power systems
Used hybrid car power systems are inexpensive and capable of tens of kilowatts of power throughput. This paper documents a process for using the second generation Toyota Prius inverter module to drive a three phase permanent magnet synchronous motor/generator from Ford hybrid vehicle. A lightweight …
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Robust state estimation in power systems
… application of robust estimation methods to the power system state estimation problem was investigated. Techniques using both nonlinear and combinatorial optimization were considered, based on the requirements that the method developed should be statistically robust, and fast enough to be used in …
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State estimation of unbalanced power systems
… of state estimates for unbalanced electric power systems. This model incorporates the effects of mutually coupled conductors, earth return paths, unbalanced device configurations, and multiple voltage references. Development of the new model appeals to multiport network theory and graph …
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Telecommunication of stabilizing signals in power systems
Deregulation of the power industry has occurred at a rapid pace, opening some promising competition between suppliers. The result of this competition should be to the benefit of customers.;Telecommunication plays a crucial role in integrating systems and ensuring smooth operation by way of …
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Voltage collapse prediction for interconnected power systems
… is used to investigate the stability of the power system. Q-V curves are used to confirm the obtained results by modal analysis method and to predict the stability margin or distance to voltage collapse based on reactive power load demand. The load characteristics are considered in this …
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Low frequency ac transmission for power systems
Conventional transmission systems utilize either high voltage ac (HVAC), operating at 50 or 60 Hz, or high voltage dc (HVDC) to transfer bulk power. The HVAC system is designed to operate at a high voltage level to reduce losses and increase bulk power transfer. This method is limited, however, by …
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Integration of electric vehicles into power systems
The power system is continuously evolving and facing various challenges, such as increasing demand, and large-scale electric vehicle (EV) penetration. These challenges have a negative impact on the reliability and sustainability of the power system. For instance, EV charging represents an intensive …
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